int impl_fuse_context::unlock_file(LPCWSTR file_name, LONGLONG byte_offset,
LONGLONG length,
PDOKAN_FILE_INFO dokan_file_info) {
impl_file_handle *hndl =
reinterpret_cast<impl_file_handle *>(dokan_file_info->Context);
if (!hndl)
return -EINVAL;
if (hndl->is_dir())
return -EACCES;
FUSE_OFF_T off;
CHECKED(cast_from_longlong(byte_offset, &off));
if (ops_.lock) {
fuse_file_info finfo(hndl->make_finfo());
struct flock lock;
lock.l_type = F_UNLCK;
lock.l_whence = SEEK_SET;
lock.l_start = off;
lock.l_len = length;
return ops_.lock(hndl->get_name().c_str(), &finfo, F_SETLK, &lock);
}
return hndl->unlock(byte_offset, length);
}
int impl_fuse_context::write_file(LPCWSTR /*file_name*/, LPCVOID buffer,
DWORD num_bytes_to_write,LPDWORD num_bytes_written,
LONGLONG offset, PDOKAN_FILE_INFO dokan_file_info)
{
//Please note, that we ifnore file_name here, because it might
//have been retargeted by a symlink.
*num_bytes_written=0; //Conform to ReadFile semantics
if (!ops_.write) return -EINVAL;
impl_file_handle *hndl=reinterpret_cast<impl_file_handle*>(dokan_file_info->Context);
if (!hndl)
return -EINVAL;
if (hndl->is_dir())
return -EACCES;
//Clip the maximum write size
if (num_bytes_to_write>conn_info_.max_write)
num_bytes_to_write=conn_info_.max_write;
FUSE_OFF_T off;
CHECKED(cast_from_longlong(offset,&off));
fuse_file_info finfo(hndl->make_finfo());
int res=ops_.write(hndl->get_name().c_str(),(const char*)buffer,
num_bytes_to_write, off,&finfo);
if (res<0) return res; //Error
//OK!
*num_bytes_written=res;
return 0;
}
int impl_fuse_context::read_file(LPCWSTR /*file_name*/, LPVOID buffer,
DWORD num_bytes_to_read, LPDWORD read_bytes,
LONGLONG offset,
PDOKAN_FILE_INFO dokan_file_info) {
// Please note, that we ignore file_name here, because it might
// have been retargeted by a symlink.
if (!ops_.read)
return -EINVAL;
*read_bytes = 0; // Conform to ReadFile semantics
impl_file_handle *hndl =
reinterpret_cast<impl_file_handle *>(dokan_file_info->Context);
if (!hndl)
return -EINVAL;
if (hndl->is_dir())
return -EACCES;
// check locking
if (hndl->check_lock(offset, num_bytes_to_read))
return -EACCES;
FUSE_OFF_T off;
CHECKED(cast_from_longlong(offset, &off));
fuse_file_info finfo(hndl->make_finfo());
DWORD total_read = 0;
while (total_read < num_bytes_to_read) {
DWORD to_read = num_bytes_to_read - total_read;
if (to_read > MAX_READ_SIZE)
to_read = MAX_READ_SIZE;
int res = ops_.read(hndl->get_name().c_str(), (char *)buffer, to_read, off,
&finfo);
if (res < 0)
return res; // Error
if (res == 0)
break; // End of file reached
total_read += res;
off += res;
buffer = (char *)buffer + res;
}
// OK!
*read_bytes = total_read;
return 0;
}
int impl_fuse_context::set_end_of_file(LPCWSTR file_name, LONGLONG byte_offset,
PDOKAN_FILE_INFO dokan_file_info) {
FUSE_OFF_T off;
CHECKED(cast_from_longlong(byte_offset, &off));
std::string fname = unixify(wchar_to_utf8_cstr(file_name));
CHECKED(check_and_resolve(&fname));
impl_file_handle *hndl =
reinterpret_cast<impl_file_handle *>(dokan_file_info->Context);
if (hndl && ops_.ftruncate) {
fuse_file_info finfo(hndl->make_finfo());
return ops_.ftruncate(hndl->get_name().c_str(), off, &finfo);
}
if (!ops_.truncate)
return -EINVAL;
return ops_.truncate(fname.c_str(), off);
}
